type-check allows you to check the types of JavaScript values at runtime with a Haskell like type syntax.

Synchronous validation of a path existing either as a file or as a directory.

Check if the process is running in a Continuous Integration (CI) environment

Detect Node.JS (as opposite to browser environment). ESM modification

Check if stdout or stderr is interactive

[](https://circleci.com/gh/unmock/json-schema-fast-check) [](https://codecov.io/g

Detect Node.JS (as opposite to browser environment) (reliable)

ECMAScript AST recursive visitor

Type checking and DDD for JavaScript

Extra assertions on top of node's assert module

Check if the current Linux session is using Wayland

A state machine compiler

Minimal module to check if a file is executable.

Type check values

simplified stream construction

Light ECMAScript (JavaScript) Value Notation - human written, concise, typed, flexible

A noop logger that conforms to the Log4j interface for modules to stub out internal logging

Run a function exactly one time

Mock Pusher.js in your JavaScript tests with ease

A stylelint custom rule to check the use of scss variable on declaration.